Agilent Technologies 4338B Manuale utente

Agilent 4338B Milliohmmeter

Service Manual

SERIAL NUMBERS

This manual applies directly to instruments with serial number prex JP1KD

or additional important information about serial numbers, read

\Instruments Covered by This Manual" in Chapter 1of

this manual.

Agilent Part No. 04338-90033

Printed in JAPAN March 2001

Notice

The information contained in this document is subject to change without notice

This document contains proprietary information that is protected by copyright. All rights are

reserved. No part of this document may be photocopied, reproduced, or translated to another

language without the prior written consent of the Agilent T

echnologies.

Agilent T

echnologies Japan, Ltd.

Component T

est PGU-Kobe

1-3-2, Murotani, Nishi-ku, Kobe-shi,

Hyogo

,651-2241 Japan



Manual Printing History

ugust 1996

::::::::::::

:::: ::::::::::::: :: ::::

First Edition (part number: 04338-90033)

June 2000

:::::::::

:::: :: :: :::::::::::::::

Second Edition (part number: 04338-90033)

March 2001

::::::::::: :: :: :: ::::

:::::::::::::

:::: ::

Third Edition (part number: 04338-90033)

iii

Safety Summary

The following general safety precautions must be observed during all phases of operation,

service

,and repair of this instrument. F

ailure to comply with these precautions or with specic

ARNINGS

elsewhere in this manual may impair the protection provided by the equipment.

In addition it violates safety standards of design, manufacture, and intended use of the

instrument.

The A

gilent T

echnologies assumes no liability for the customer's failure to comply with these

requirements

Note

4338B complies with INST

ALLA

TION CA

TEGORY II and POLLUTION DEGREE 2

in IEC1010-1. 4338B is INDOOR USE product.

Ground The Instrument

oavoid electric shock hazard, the instrument chassis and cabinet must be connected to a

safety earth ground by the supplied power cable with earth blade

DO NOT Operate In An Explosive Atmosphere

Do not operate the instrument in the presence of ammable gasses or fumes

.Operation of any

electrical instrument in such an environment constitutes adenite safety hazard.

eep Away From Live Circuits

Operating personnel must not remove instrument covers

.Component replacement and internal

adjustments must be made by qualied maintenance personnel. Do not replace components

with the power cable connected. Under certain conditions

,dangerous voltages may exist even

with the power cable removed. T

oavoid injuries

,always disconnect power and discharge

circuits before touching them.

DO NOT Service Or A

djust Alone

Do not attempt internal service or adjustment unless another person, capable of rendering rst

aid and resuscitation, is present.

DO NOT Substitute P

arts Or Modify Instrument

Because of the danger of introducing additional hazards

, do not install substitute parts or

perform unauthorized modications to the instrument. Return the instrument to a Agilent

Technologies Sales and Service Oce for service and repair to ensure that safety features are

maintained.

Dangerous Procedure W

arnings

Warnings

, such as the example below

, precede potentially dangerous procedures throughout

this manual. Instructions contained in the warnings must be followed.

Warning

Dangerous voltages, capable of causing death, are present in this

instrument. Use extreme caution when handling, testing, and adjusting

this instrument.

Certication

Agilent T

echnologies certies that this product met its published specications at the time

of shipment from the factory

.Agilent T

echnologies further certies that its calibration

measurements are traceable to the United States National Institute of Standards and

echnology

,to the extent allowed by the Institution's calibration facility

,or

to the calibration

facilities of other International Standards Organization members.

arranty

This Agilent T

echnologies instrument product is warranted against defects in material and

workmanship for aperiod of one year from the date of shipment, except that in the case of

certain components listed in

General Information

of this manual, the warranty shall be for the

specied period. During the warranty period, Agilent Technologies Company will, at its option,

either repair or replace products that prove to be defective

or warranty service or repair

,this product must be returned to aservice facility designated by

Agilent Technologies

. Buyer shall prepay shipping charges to Agilent T

echnologies and Agilent

echnologies shall pay shipping charges to return the product to Buyer

.However

,Buyer shall

pay all shipping charges

,duties

,and taxes for products returned to Agilent T

echnologies from

another country

Agilent T

echnologies warrants that its software and rmware designated by Agilent

echnologies for use with an instrument will execute its programming instruction when

property installed on that instrument. Agilent T

echnologies does not warrant that the operation

of the instrument, or software

,or rmware will be uninterrupted or error free

Limitation Of W

arranty

The foregoing warranty shall not apply to defects resulting from improper or inadequate

maintenance by Buyer

,Buyer-supplied software or interfacing, unauthorized modication or

misuse

,operation outside the environmental specications for the product, or improper site

preparation or maintenance

No other warranty is expressed or implied. A

gilent T

echnologies specically disclaims the

implied warranties of merchantability and tness for aparticular purpose

Exclusive Remedies

The remedies provided herein are buyer's sole and exclusive remedies

gilent T

echnologies

shall not be liable for any direct, indirect, special, incidental, or consequential damages,

whether based on contract, tort, or any other legal theory

Assistance

Product maintenance agreements and other customer assistance agreements are available for

Agilent T

echnologies products

or any assistance

,contact your nearest Agilent Technologies Sales and Service Oce

ddresses are provided at the back of this manual.

Safety Symbols

General denitions of safety symbols used on equipment or in manuals are listed below

Instruction manual symbol: the product is marked with this symbol when it is

necessary for the user to refer to the instruction manual.

Alternating current.

Direct current.

On (Supply).

O (Supply).

Frame or chassis terminal

This

arning

sign denotes ahazard. It calls attention to a procedure

,practice

condition or the like

,which, if not correctly performed or adhered to

,could

result in injury or death to personnel.

This

Caution

sign denotes a hazard. It calls attention to aprocedure

,practice

condition or the like

,which, if not correctly performed or adhered to

,could

result in damage to or destruction of part or all of the product.

Note

denotes important information. It calls attention to aprocedure

practice

,condition or the like

,which is essential to highlight.

vii

Documentation Map

Operation Manual

Operation Manual (Agilent P

art Number: 04338-90030 for English edition, 04338-97030 for

Japanese edition) explains specications

,basic measurement explanations

,andhow to verify

conformance to published specications

Service Manual

Service Manual (Agilent P

art Number: 04338-90043) explains how to adjust, troubleshoot, and

repair the 4338B.

How T

oUse This Manual

This is the Service Manual for the 4338B Milliohmmeter

.This manual contains adjustments and

repair information, and consists of the following four chapters

Chapter 1General Information

Chapter 1gives general information for servicing the 4338B .This chapter lists the

recommended equipment for adjustments and troubleshooting.

Chapter 2A

djustments

Chapter 2describes the adjustments

,required to ensure that the 4338B is within its published

specications after it has been repaired, or it fails the performance tests

Chapter 3Assembly Replacement

Chapter 3provides the information on replacing the 4338B assemblies. The information

includes replaceable assembly lists

,and removal and installation procedures.

Chapter 4Troubleshooting

Chapter 4provides the information on troubleshooting the 4338B.The information includes

theory of operation and information on faulty assembly isolation.

Appendix A Manual Changes

Appendix A contains manual changes and provides information for using this manual with

4338Bs manufactured before the printing date of the manual.

Appendix B Default Jumper and Switch Settings

Appendix B describes the settings of the jumpers and switches on the 4338B A2 CPU Board

Assembly. The information is required when the A2 assembly is replaced.

viii

Contents

1. General Information

Introduction ....................

.........1-1

Instruments Covered by This Manual ................

. 1-1

Required Equipment ...................

....1-2

2. A

djustment

Introduction ................

...........2-1

Safety Consideration ................. .. .. .......2-1

Required Equipment .................

..........2-1

djustment T

ools .....................

.........2-2

Adjustable Components . .......................

. 2-2

actory-Selected Components ................

.....2-2

EEPROM Write Protect Switch ...............

...2-2

Related A

djustment .................... .........2-2

djustment Program ..................

.........2-3

Program Installation ..................... .......2-4

Making aW

orking Copy .........................2-4

Program Execution .............

...............2-4

djustment Procedure References ............

..........2-5

Resistance Measurement A

djustment .............

.......2-5

Equipment ...............................2-5

Setup .................. ................2-5

3. Assembly Replacement

Introduction ......

..................... 3-1

Ordering Information .......

.................3-1

Restored Exchange Assemblies ........ ..

..............3-1

Replacing the A2 CPU Board Assembly . ................... 3-2

Replaceable Assembly List ..

..................... . 3-2

Replaceable Mechanical P

arts List ..

............... .. 3-5

Disassembly Procedures .........

............

......3-9

Tools and F

asteners ............. .. .. .. .. .. .. .. . 3-9

Cover Removal .. .. .. .. .. .. .. .. .. .. .......... 3-9

A1 Main Board Removal ....................

...... 3-10

Removal Procedure ...... .. .. .. .. .. .. .. .. . .. .. 3-10

A2 CPU Board Assembly Removal ..................... 3-10

Removal Procedure .... .. .. .. .. .. .. .. .. .. . .... 3-10

A5 A

C Inlet Board Assembly Removal . . . . ................ 3-10

Removal Procedure ...... .. .. .. .. .. .. .. .. . .. .. 3-10

Keyboard Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Removal Procedure ...... .. .. .. .. .. .. .. .. . .. .. 3-11

LCD Assembly Removal ... .. .. .. .. . .. .. .. .. .. .. .. 3-11

Removal Procedure ...... .. .. .. .. .. .. .. .. . .. .. 3-11

BNC Connector Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11

Removal Procedure ...... .. .. .. .. .. .. .. .. . .. .. 3-11

Contents-1

4. Troubleshooting

Introduction ..

.............

......4-1

Safety Considerations . .............

.4-1

Required Equipment . ............... .. .. .. .. .. ...4-1

After Service Product Safety Checks .............

.. 4-2

Theory of Operation ...............

....4-3

Overall Measurement Theory .............

.....4-3

Overall Block Diagram ............... .. .. ........4-4

Analog Section .................. .. ..........4-5

Signal Source Section ...............

.......4-6

Range Resistor and Current Sense Amplier Sections ...........

. 4-7

oltage Sense Amplier and Process Amplier Sections ......

.. 4-8

Digital Section ............

.............4-9

ower Supply Section ..........

...........4-10

Troubleshooting .............

............4-11

Check Procedure References ............. .. .. .......4-13

Check 1, DC-DC Converter Output V

oltage .......

...4-13

Check 2, LCD Displays Anything? .......

............4-14

Check 3, LCD Operates Correctly? ....................4-14

Check 4, Any Error Message on LCD? ...................4-14

Check 5, CPU Related Error Message? .......

........4-14

Check 6, CPU P

ower LED Lights? ......

.........4-14

Check 7, Any Error Code on LED? ..

..................4-15

Check 8, CPU Fuse High Lead V

oltage . ..................4-16

Check 9, Fuse and Line Switch . .. ...................4-16

Check 10, DC-DC Converter Input V

oltage .................4-17

Check 11, DC-DC Converter Open Output V

oltages . ............4-18

Check 12, Transformer Secondary V

oltage .................4-19

A. Manual Changes

Introduction ..

.......................

....A

-1

Manual Changes . ..

......................... ...A

-1

.Default Jumper and Switch Settings

Introduction ...................

..........B-1

Jumper and Switch Settings .................. .. .....B-1

Index

Contents-2

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